Diesel engines burn as much as 30% less fuel than gasoline

58. Diesel engines burn as much as 30% less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have been implicated in global warming.

A of comparable size , as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have

Diesel engines BURN [as much as 30% less fuel than gasoline engines [u]of comparable size ], as well as emitting

BURN and EMITTING are not parallel.... it should rather be BURN and EMIT.

B of comparable size, as well as emit far less carbon dioxide gas and far fewer of the other gasses having

The HAVING suggests that it's the diesel engine itself that's been implicated

C of comparable size, and also they emit far fewer carbon dioxide and other gasses that have

While not the best this is the best of the lot.

D that have a comparable size, and also they emit far fewer of the other gasses having

Same problem as in B. Having links to diesel engine. Besides the reference of THEY is ambigous

E that have a comparable size, as well as emitting far fewer of the other gasses having

Same problem as in A and B.

Sondenso...what's the source of this question?

58. Diesel engines burn as much as 30% less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have been implicated in global warming.
A of comparable size , as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have
B of comparable size, as well as emit far less carbon dioxide gas and far fewer of the other gasses having
Altered Intent: having been implicated incorrectly points to engines. But the gases have been implicated NOT engines.
C of comparable size, and also they emit far fewer carbon dioxide and other gasses that have
Don't need both 'and' + 'also'. Either and they emit or also they emit should do.
Moreover, 'they' refers to what? (diesel engines / gasoline engines?)
Also, fewer carbon dioxide is wrong. 'Less' should be used.
D that have a comparable size, and also they emit far fewer of the other gasses having
same as above.
E that have a comparable size, as well as emitting far fewer of the other gasses having

58. Diesel engines burn as much as 30% less fuel than gasoline engines of comparable size, as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have been implicated in global warming.
A of comparable size , as well as emitting far less carbon dioxide gas and far fewer of the other gasses that have
B of comparable size, as well as emit far less carbon dioxide gas and far fewer of the other gasses having
C of comparable size, and also they emit far fewer carbon dioxide and other gasses that have
D that have a comparable size, and also they emit far fewer of the other gasses having
E that have a comparable size, as well as emitting far fewer of the other gasses having

Though I eliminated A as soon as I saw the 'emitting', which is not parallel with 'burn' , A is a little better than other options.
A is my choice.

My approach towards SC is always unconventional

Same problem as in B. Having links to diesel engine. Besides the reference of THEY is ambigous

also I would think it is incorrect to say fewer carbondioxide, it should be less carbondioxide(non-countable)

emitting modifies diesel engines..its progressive noun

B,D,E are out beacause of "having' at the end.

can someone explain me why "having" is wrong here?